
<h1><span class="yiyi-st" id="yiyi-12">numpy.argwhere</span></h1>
        <blockquote>
        <p>原文：<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.argwhere.html">https://docs.scipy.org/doc/numpy/reference/generated/numpy.argwhere.html</a></p>
        <p>译者：<a href="https://github.com/wizardforcel">飞龙</a> <a href="http://usyiyi.cn/">UsyiyiCN</a></p>
        <p>校对：（虚位以待）</p>
        </blockquote>
    
<dl class="function">
<dt id="numpy.argwhere"><span class="yiyi-st" id="yiyi-13"> <code class="descclassname">numpy.</code><code class="descname">argwhere</code><span class="sig-paren">(</span><em>a</em><span class="sig-paren">)</span><a class="reference external" href="http://github.com/numpy/numpy/blob/v1.11.3/numpy/core/numeric.py#L763-L801"><span class="viewcode-link">[source]</span></a></span></dt>
<dd><p><span class="yiyi-st" id="yiyi-14">找到非零的数组元素的索引，按元素分组。</span></p>
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<tr class="field-odd field"><th class="field-name"><span class="yiyi-st" id="yiyi-15">参数：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-16"><strong>a</strong>：array_like</span></p>
<blockquote>
<div><p><span class="yiyi-st" id="yiyi-17">输入数据。</span></p>
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<tr class="field-even field"><th class="field-name"><span class="yiyi-st" id="yiyi-18">返回：</span></th><td class="field-body"><p class="first"><span class="yiyi-st" id="yiyi-19"><strong>index_array</strong>：ndarray</span></p>
<blockquote class="last">
<div><p><span class="yiyi-st" id="yiyi-20">非零元素的索引。</span><span class="yiyi-st" id="yiyi-21">指数按元素分组。</span></p>
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<div class="admonition seealso">
<p class="first admonition-title"><span class="yiyi-st" id="yiyi-22">也可以看看</span></p>
<p class="last"><span class="yiyi-st" id="yiyi-23"><a class="reference internal" href="numpy.where.html#numpy.where" title="numpy.where"><code class="xref py py-obj docutils literal"><span class="pre">where</span></code></a>，<a class="reference internal" href="numpy.nonzero.html#numpy.nonzero" title="numpy.nonzero"><code class="xref py py-obj docutils literal"><span class="pre">nonzero</span></code></a></span></p>
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<p class="rubric"><span class="yiyi-st" id="yiyi-24">笔记</span></p>
<p><span class="yiyi-st" id="yiyi-25"><code class="docutils literal"><span class="pre">np.argwhere(a)</span></code>与<code class="docutils literal"><span class="pre">np.transpose(np.nonzero(a))</span></code>相同。</span></p>
<p><span class="yiyi-st" id="yiyi-26"><code class="docutils literal"><span class="pre">argwhere</span></code>的输出不适合索引数组。</span><span class="yiyi-st" id="yiyi-27">为此，请改用<code class="docutils literal"><span class="pre">where(a)</span></code>。</span></p>
<p class="rubric"><span class="yiyi-st" id="yiyi-28">例子</span></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="n">x</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">6</span><span class="p">)</span><span class="o">.</span><span class="n">reshape</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="mi">3</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">x</span>
<span class="go">array([[0, 1, 2],</span>
<span class="go">       [3, 4, 5]])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">np</span><span class="o">.</span><span class="n">argwhere</span><span class="p">(</span><span class="n">x</span><span class="o">&gt;</span><span class="mi">1</span><span class="p">)</span>
<span class="go">array([[0, 2],</span>
<span class="go">       [1, 0],</span>
<span class="go">       [1, 1],</span>
<span class="go">       [1, 2]])</span>
</pre></div>
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